blob: 31d98b57e1deafdea9f6b91054313f21e1408c6b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* net/atm/signaling.c - ATM signaling */
2
3/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4
5
6#include <linux/errno.h> /* error codes */
7#include <linux/kernel.h> /* printk */
8#include <linux/skbuff.h>
9#include <linux/wait.h>
10#include <linux/sched.h> /* jiffies and HZ */
11#include <linux/atm.h> /* ATM stuff */
12#include <linux/atmsap.h>
13#include <linux/atmsvc.h>
14#include <linux/atmdev.h>
15#include <linux/bitops.h>
16
17#include "resources.h"
18#include "signaling.h"
19
20
21#undef WAIT_FOR_DEMON /* #define this if system calls on SVC sockets
22 should block until the demon runs.
23 Danger: may cause nasty hangs if the demon
24 crashes. */
25
26#if 0
27#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
28#else
29#define DPRINTK(format,args...)
30#endif
31
32
33struct atm_vcc *sigd = NULL;
34#ifdef WAIT_FOR_DEMON
35static DECLARE_WAIT_QUEUE_HEAD(sigd_sleep);
36#endif
37
38
39static void sigd_put_skb(struct sk_buff *skb)
40{
41#ifdef WAIT_FOR_DEMON
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 DECLARE_WAITQUEUE(wait,current);
43
44 add_wait_queue(&sigd_sleep,&wait);
45 while (!sigd) {
46 set_current_state(TASK_UNINTERRUPTIBLE);
Chas Williams0f8f3252006-03-03 17:49:58 -080047 DPRINTK("atmsvc: waiting for signaling demon...\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 schedule();
49 }
50 current->state = TASK_RUNNING;
51 remove_wait_queue(&sigd_sleep,&wait);
52#else
53 if (!sigd) {
Chas Williams0f8f3252006-03-03 17:49:58 -080054 DPRINTK("atmsvc: no signaling demon\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 kfree_skb(skb);
56 return;
57 }
58#endif
59 atm_force_charge(sigd,skb->truesize);
60 skb_queue_tail(&sk_atm(sigd)->sk_receive_queue,skb);
61 sk_atm(sigd)->sk_data_ready(sk_atm(sigd), skb->len);
62}
63
64
65static void modify_qos(struct atm_vcc *vcc,struct atmsvc_msg *msg)
66{
67 struct sk_buff *skb;
68
69 if (test_bit(ATM_VF_RELEASED,&vcc->flags) ||
70 !test_bit(ATM_VF_READY,&vcc->flags))
71 return;
72 msg->type = as_error;
73 if (!vcc->dev->ops->change_qos) msg->reply = -EOPNOTSUPP;
74 else {
75 /* should lock VCC */
76 msg->reply = vcc->dev->ops->change_qos(vcc,&msg->qos,
77 msg->reply);
78 if (!msg->reply) msg->type = as_okay;
79 }
80 /*
81 * Should probably just turn around the old skb. But the, the buffer
82 * space accounting needs to follow the change too. Maybe later.
83 */
84 while (!(skb = alloc_skb(sizeof(struct atmsvc_msg),GFP_KERNEL)))
85 schedule();
86 *(struct atmsvc_msg *) skb_put(skb,sizeof(struct atmsvc_msg)) = *msg;
87 sigd_put_skb(skb);
88}
89
90
91static int sigd_send(struct atm_vcc *vcc,struct sk_buff *skb)
92{
93 struct atmsvc_msg *msg;
94 struct atm_vcc *session_vcc;
95 struct sock *sk;
96
97 msg = (struct atmsvc_msg *) skb->data;
98 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
99 DPRINTK("sigd_send %d (0x%lx)\n",(int) msg->type,
100 (unsigned long) msg->vcc);
101 vcc = *(struct atm_vcc **) &msg->vcc;
102 sk = sk_atm(vcc);
103
104 switch (msg->type) {
105 case as_okay:
106 sk->sk_err = -msg->reply;
107 clear_bit(ATM_VF_WAITING, &vcc->flags);
108 if (!*vcc->local.sas_addr.prv &&
109 !*vcc->local.sas_addr.pub) {
110 vcc->local.sas_family = AF_ATMSVC;
111 memcpy(vcc->local.sas_addr.prv,
112 msg->local.sas_addr.prv,ATM_ESA_LEN);
113 memcpy(vcc->local.sas_addr.pub,
114 msg->local.sas_addr.pub,ATM_E164_LEN+1);
115 }
116 session_vcc = vcc->session ? vcc->session : vcc;
117 if (session_vcc->vpi || session_vcc->vci) break;
118 session_vcc->itf = msg->pvc.sap_addr.itf;
119 session_vcc->vpi = msg->pvc.sap_addr.vpi;
120 session_vcc->vci = msg->pvc.sap_addr.vci;
121 if (session_vcc->vpi || session_vcc->vci)
122 session_vcc->qos = msg->qos;
123 break;
124 case as_error:
125 clear_bit(ATM_VF_REGIS,&vcc->flags);
126 clear_bit(ATM_VF_READY,&vcc->flags);
127 sk->sk_err = -msg->reply;
128 clear_bit(ATM_VF_WAITING, &vcc->flags);
129 break;
130 case as_indicate:
131 vcc = *(struct atm_vcc **) &msg->listen_vcc;
Chas Williams208a6df2005-04-21 16:44:57 -0700132 sk = sk_atm(vcc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 DPRINTK("as_indicate!!!\n");
134 lock_sock(sk);
135 if (sk_acceptq_is_full(sk)) {
136 sigd_enq(NULL,as_reject,vcc,NULL,NULL);
137 dev_kfree_skb(skb);
138 goto as_indicate_complete;
139 }
140 sk->sk_ack_backlog++;
141 skb_queue_tail(&sk->sk_receive_queue, skb);
142 DPRINTK("waking sk->sk_sleep 0x%p\n", sk->sk_sleep);
143 sk->sk_state_change(sk);
144as_indicate_complete:
145 release_sock(sk);
146 return 0;
147 case as_close:
148 set_bit(ATM_VF_RELEASED,&vcc->flags);
149 vcc_release_async(vcc, msg->reply);
150 goto out;
151 case as_modify:
152 modify_qos(vcc,msg);
153 break;
154 case as_addparty:
155 case as_dropparty:
156 sk->sk_err_soft = msg->reply; /* < 0 failure, otherwise ep_ref */
157 clear_bit(ATM_VF_WAITING, &vcc->flags);
158 break;
159 default:
160 printk(KERN_ALERT "sigd_send: bad message type %d\n",
161 (int) msg->type);
162 return -EINVAL;
163 }
164 sk->sk_state_change(sk);
165out:
166 dev_kfree_skb(skb);
167 return 0;
168}
169
170
171void sigd_enq2(struct atm_vcc *vcc,enum atmsvc_msg_type type,
172 struct atm_vcc *listen_vcc,const struct sockaddr_atmpvc *pvc,
173 const struct sockaddr_atmsvc *svc,const struct atm_qos *qos,int reply)
174{
175 struct sk_buff *skb;
176 struct atmsvc_msg *msg;
177 static unsigned session = 0;
178
179 DPRINTK("sigd_enq %d (0x%p)\n",(int) type,vcc);
180 while (!(skb = alloc_skb(sizeof(struct atmsvc_msg),GFP_KERNEL)))
181 schedule();
182 msg = (struct atmsvc_msg *) skb_put(skb,sizeof(struct atmsvc_msg));
183 memset(msg,0,sizeof(*msg));
184 msg->type = type;
185 *(struct atm_vcc **) &msg->vcc = vcc;
186 *(struct atm_vcc **) &msg->listen_vcc = listen_vcc;
187 msg->reply = reply;
188 if (qos) msg->qos = *qos;
189 if (vcc) msg->sap = vcc->sap;
190 if (svc) msg->svc = *svc;
191 if (vcc) msg->local = vcc->local;
192 if (pvc) msg->pvc = *pvc;
193 if (vcc) {
194 if (type == as_connect && test_bit(ATM_VF_SESSION, &vcc->flags))
195 msg->session = ++session;
196 /* every new pmp connect gets the next session number */
197 }
198 sigd_put_skb(skb);
199 if (vcc) set_bit(ATM_VF_REGIS,&vcc->flags);
200}
201
202
203void sigd_enq(struct atm_vcc *vcc,enum atmsvc_msg_type type,
204 struct atm_vcc *listen_vcc,const struct sockaddr_atmpvc *pvc,
205 const struct sockaddr_atmsvc *svc)
206{
207 sigd_enq2(vcc,type,listen_vcc,pvc,svc,vcc ? &vcc->qos : NULL,0);
208 /* other ISP applications may use "reply" */
209}
210
211
212static void purge_vcc(struct atm_vcc *vcc)
213{
214 if (sk_atm(vcc)->sk_family == PF_ATMSVC &&
Chas Williams9301e322005-09-28 16:35:01 -0700215 !test_bit(ATM_VF_META, &vcc->flags)) {
216 set_bit(ATM_VF_RELEASED, &vcc->flags);
217 clear_bit(ATM_VF_REGIS, &vcc->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 vcc_release_async(vcc, -EUNATCH);
219 }
220}
221
222
223static void sigd_close(struct atm_vcc *vcc)
224{
225 struct hlist_node *node;
226 struct sock *s;
227 int i;
228
229 DPRINTK("sigd_close\n");
230 sigd = NULL;
231 if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
232 printk(KERN_ERR "sigd_close: closing with requests pending\n");
233 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
234
235 read_lock(&vcc_sklist_lock);
236 for(i = 0; i < VCC_HTABLE_SIZE; ++i) {
237 struct hlist_head *head = &vcc_hash[i];
238
239 sk_for_each(s, node, head) {
240 struct atm_vcc *vcc = atm_sk(s);
241
Chas Williams9301e322005-09-28 16:35:01 -0700242 purge_vcc(vcc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 }
244 }
245 read_unlock(&vcc_sklist_lock);
246}
247
248
249static struct atmdev_ops sigd_dev_ops = {
250 .close = sigd_close,
251 .send = sigd_send
252};
253
254
255static struct atm_dev sigd_dev = {
256 .ops = &sigd_dev_ops,
257 .type = "sig",
258 .number = 999,
259 .lock = SPIN_LOCK_UNLOCKED
260};
261
262
263int sigd_attach(struct atm_vcc *vcc)
264{
265 if (sigd) return -EADDRINUSE;
266 DPRINTK("sigd_attach\n");
267 sigd = vcc;
268 vcc->dev = &sigd_dev;
269 vcc_insert_socket(sk_atm(vcc));
270 set_bit(ATM_VF_META,&vcc->flags);
271 set_bit(ATM_VF_READY,&vcc->flags);
272#ifdef WAIT_FOR_DEMON
273 wake_up(&sigd_sleep);
274#endif
275 return 0;
276}